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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GVariantType: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-data-types.html" title="GLib Data Types"> <link rel="prev" href="glib-Datasets.html" title="Datasets"> <link rel="next" href="glib-GVariant.html" title="GVariant"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#glib-GVariantType.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-data-types.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Datasets.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-GVariant.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-GVariantType"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-GVariantType.top_of_page"></a>GVariantType</span></h2> <p>GVariantType — introduction to the GVariant type system</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-GVariantType.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE:CAPS" title="G_VARIANT_TYPE()">G_VARIANT_TYPE</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()">g_variant_type_free</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-copy" title="g_variant_type_copy ()">g_variant_type_copy</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-new" title="g_variant_type_new ()">g_variant_type_new</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-string-is-valid" title="g_variant_type_string_is_valid ()">g_variant_type_string_is_valid</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-string-scan" title="g_variant_type_string_scan ()">g_variant_type_string_scan</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-get-string-length" title="g_variant_type_get_string_length ()">g_variant_type_get_string_length</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-peek-string" title="g_variant_type_peek_string ()">g_variant_type_peek_string</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-dup-string" title="g_variant_type_dup_string ()">g_variant_type_dup_string</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-definite" title="g_variant_type_is_definite ()">g_variant_type_is_definite</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-container" title="g_variant_type_is_container ()">g_variant_type_is_container</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-basic" title="g_variant_type_is_basic ()">g_variant_type_is_basic</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-maybe" title="g_variant_type_is_maybe ()">g_variant_type_is_maybe</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-array" title="g_variant_type_is_array ()">g_variant_type_is_array</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-tuple" title="g_variant_type_is_tuple ()">g_variant_type_is_tuple</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-dict-entry" title="g_variant_type_is_dict_entry ()">g_variant_type_is_dict_entry</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-variant" title="g_variant_type_is_variant ()">g_variant_type_is_variant</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="returnvalue">guint</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-hash" title="g_variant_type_hash ()">g_variant_type_hash</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-equal" title="g_variant_type_equal ()">g_variant_type_equal</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-is-subtype-of" title="g_variant_type_is_subtype_of ()">g_variant_type_is_subtype_of</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-new-maybe" title="g_variant_type_new_maybe ()">g_variant_type_new_maybe</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-new-array" title="g_variant_type_new_array ()">g_variant_type_new_array</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-new-tuple" title="g_variant_type_new_tuple ()">g_variant_type_new_tuple</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-new-dict-entry" title="g_variant_type_new_dict_entry ()">g_variant_type_new_dict_entry</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-element" title="g_variant_type_element ()">g_variant_type_element</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-n-items" title="g_variant_type_n_items ()">g_variant_type_n_items</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-first" title="g_variant_type_first ()">g_variant_type_first</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-next" title="g_variant_type_next ()">g_variant_type_next</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-key" title="g_variant_type_key ()">g_variant_type_key</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GVariantType.html#g-variant-type-value" title="g_variant_type_value ()">g_variant_type_value</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-GVariantType.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType">GVariantType</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BOOLEAN:CAPS" title="G_VARIANT_TYPE_BOOLEAN">G_VARIANT_TYPE_BOOLEAN</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BYTE:CAPS" title="G_VARIANT_TYPE_BYTE">G_VARIANT_TYPE_BYTE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT16:CAPS" title="G_VARIANT_TYPE_INT16">G_VARIANT_TYPE_INT16</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT16:CAPS" title="G_VARIANT_TYPE_UINT16">G_VARIANT_TYPE_UINT16</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT32:CAPS" title="G_VARIANT_TYPE_INT32">G_VARIANT_TYPE_INT32</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT32:CAPS" title="G_VARIANT_TYPE_UINT32">G_VARIANT_TYPE_UINT32</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT64:CAPS" title="G_VARIANT_TYPE_INT64">G_VARIANT_TYPE_INT64</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT64:CAPS" title="G_VARIANT_TYPE_UINT64">G_VARIANT_TYPE_UINT64</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-HANDLE:CAPS" title="G_VARIANT_TYPE_HANDLE">G_VARIANT_TYPE_HANDLE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DOUBLE:CAPS" title="G_VARIANT_TYPE_DOUBLE">G_VARIANT_TYPE_DOUBLE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-STRING:CAPS" title="G_VARIANT_TYPE_STRING">G_VARIANT_TYPE_STRING</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-OBJECT-PATH:CAPS" title="G_VARIANT_TYPE_OBJECT_PATH">G_VARIANT_TYPE_OBJECT_PATH</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-SIGNATURE:CAPS" title="G_VARIANT_TYPE_SIGNATURE">G_VARIANT_TYPE_SIGNATURE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-VARIANT:CAPS" title="G_VARIANT_TYPE_VARIANT">G_VARIANT_TYPE_VARIANT</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ANY:CAPS" title="G_VARIANT_TYPE_ANY">G_VARIANT_TYPE_ANY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BASIC:CAPS" title="G_VARIANT_TYPE_BASIC">G_VARIANT_TYPE_BASIC</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-MAYBE:CAPS" title="G_VARIANT_TYPE_MAYBE">G_VARIANT_TYPE_MAYBE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY">G_VARIANT_TYPE_ARRAY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE">G_VARIANT_TYPE_TUPLE</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UNIT:CAPS" title="G_VARIANT_TYPE_UNIT">G_VARIANT_TYPE_UNIT</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DICT-ENTRY:CAPS" title="G_VARIANT_TYPE_DICT_ENTRY">G_VARIANT_TYPE_DICT_ENTRY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DICTIONARY:CAPS" title="G_VARIANT_TYPE_DICTIONARY">G_VARIANT_TYPE_DICTIONARY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-STRING-ARRAY:CAPS" title="G_VARIANT_TYPE_STRING_ARRAY">G_VARIANT_TYPE_STRING_ARRAY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-OBJECT-PATH-ARRAY:CAPS" title="G_VARIANT_TYPE_OBJECT_PATH_ARRAY">G_VARIANT_TYPE_OBJECT_PATH_ARRAY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BYTESTRING:CAPS" title="G_VARIANT_TYPE_BYTESTRING">G_VARIANT_TYPE_BYTESTRING</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BYTESTRING-ARRAY:CAPS" title="G_VARIANT_TYPE_BYTESTRING_ARRAY">G_VARIANT_TYPE_BYTESTRING_ARRAY</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-VARDICT:CAPS" title="G_VARIANT_TYPE_VARDICT">G_VARIANT_TYPE_VARDICT</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-GVariantType.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> #include <glib/gi18n.h> </pre> </div> <div class="refsect1"> <a name="glib-GVariantType.description"></a><h2>Description</h2> <p>This section introduces the GVariant type system. It is based, in large part, on the D-Bus type system, with two major changes and some minor lifting of restrictions. The <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html" target="_top">D-Bus specification</a>, therefore, provides a significant amount of information that is useful when working with GVariant.</p> <p>The first major change with respect to the D-Bus type system is the introduction of maybe (or "nullable") types. Any type in GVariant can be converted to a maybe type, in which case, "nothing" (or "null") becomes a valid value. Maybe types have been added by introducing the character "m" to type strings.</p> <p>The second major change is that the GVariant type system supports the concept of "indefinite types" -- types that are less specific than the normal types found in D-Bus. For example, it is possible to speak of "an array of any type" in GVariant, where the D-Bus type system would require you to speak of "an array of integers" or "an array of strings". Indefinite types have been added by introducing the characters "*", "?" and "r" to type strings.</p> <p>Finally, all arbitrary restrictions relating to the complexity of types are lifted along with the restriction that dictionary entries may only appear nested inside of arrays.</p> <p>Just as in D-Bus, GVariant types are described with strings ("type strings"). Subject to the differences mentioned above, these strings are of the same form as those found in DBus. Note, however: D-Bus always works in terms of messages and therefore individual type strings appear nowhere in its interface. Instead, "signatures" are a concatenation of the strings of the type of each argument in a message. GVariant deals with single values directly so GVariant type strings always describe the type of exactly one value. This means that a D-Bus signature string is generally not a valid GVariant type string -- except in the case that it is the signature of a message containing exactly one argument.</p> <p>An indefinite type is similar in spirit to what may be called an abstract type in other type systems. No value can exist that has an indefinite type as its type, but values can exist that have types that are subtypes of indefinite types. That is to say, <a class="link" href="glib-GVariant.html#g-variant-get-type" title="g_variant_get_type ()"><code class="function">g_variant_get_type()</code></a> will never return an indefinite type, but calling <a class="link" href="glib-GVariant.html#g-variant-is-of-type" title="g_variant_is_of_type ()"><code class="function">g_variant_is_of_type()</code></a> with an indefinite type may return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>. For example, you cannot have a value that represents "an array of no particular type", but you can have an "array of integers" which certainly matches the type of "an array of no particular type", since "array of integers" is a subtype of "array of no particular type".</p> <p>This is similar to how instances of abstract classes may not directly exist in other type systems, but instances of their non-abstract subtypes may. For example, in GTK, no object that has the type of <span class="type">GtkBin</span> can exist (since <span class="type">GtkBin</span> is an abstract class), but a <span class="type">GtkWindow</span> can certainly be instantiated, and you would say that the <span class="type">GtkWindow</span> is a <span class="type">GtkBin</span> (since <span class="type">GtkWindow</span> is a subclass of <span class="type">GtkBin</span>).</p> <div class="refsect3"> <a name="id-1.6.18.6.9"></a><h4>GVariant Type Strings</h4> <p>A GVariant type string can be any of the following:</p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p>any basic type string (listed below)</p></li> <li class="listitem"><p>"v", "r" or "*"</p></li> <li class="listitem"><p>one of the characters 'a' or 'm', followed by another type string</p></li> <li class="listitem"><p>the character '(', followed by a concatenation of zero or more other type strings, followed by the character ')'</p></li> <li class="listitem"><p>the character '{', followed by a basic type string (see below), followed by another type string, followed by the character '}'</p></li> </ul></div> <p>A basic type string describes a basic type (as per <a class="link" href="glib-GVariantType.html#g-variant-type-is-basic" title="g_variant_type_is_basic ()"><code class="function">g_variant_type_is_basic()</code></a>) and is always a single character in length. The valid basic type strings are "b", "y", "n", "q", "i", "u", "x", "t", "h", "d", "s", "o", "g" and "?".</p> <p>The above definition is recursive to arbitrary depth. "aaaaai" and "(ui(nq((y)))s)" are both valid type strings, as is "a(aa(ui)(qna{ya(yd)}))". In order to not hit memory limits, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> imposes a limit on recursion depth of 65 nested containers. This is the limit in the D-Bus specification (64) plus one to allow a <span class="type">GDBusMessage</span> to be nested in a top-level tuple.</p> <p>The meaning of each of the characters is as follows:</p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p><code class="literal">b</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BOOLEAN:CAPS" title="G_VARIANT_TYPE_BOOLEAN"><code class="literal">G_VARIANT_TYPE_BOOLEAN</code></a>; a boolean value.</p></li> <li class="listitem"><p><code class="literal">y</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BYTE:CAPS" title="G_VARIANT_TYPE_BYTE"><code class="literal">G_VARIANT_TYPE_BYTE</code></a>; a byte.</p></li> <li class="listitem"><p><code class="literal">n</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT16:CAPS" title="G_VARIANT_TYPE_INT16"><code class="literal">G_VARIANT_TYPE_INT16</code></a>; a signed 16 bit integer.</p></li> <li class="listitem"><p><code class="literal">q</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT16:CAPS" title="G_VARIANT_TYPE_UINT16"><code class="literal">G_VARIANT_TYPE_UINT16</code></a>; an unsigned 16 bit integer.</p></li> <li class="listitem"><p><code class="literal">i</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT32:CAPS" title="G_VARIANT_TYPE_INT32"><code class="literal">G_VARIANT_TYPE_INT32</code></a>; a signed 32 bit integer.</p></li> <li class="listitem"><p><code class="literal">u</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT32:CAPS" title="G_VARIANT_TYPE_UINT32"><code class="literal">G_VARIANT_TYPE_UINT32</code></a>; an unsigned 32 bit integer.</p></li> <li class="listitem"><p><code class="literal">x</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT64:CAPS" title="G_VARIANT_TYPE_INT64"><code class="literal">G_VARIANT_TYPE_INT64</code></a>; a signed 64 bit integer.</p></li> <li class="listitem"><p><code class="literal">t</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT64:CAPS" title="G_VARIANT_TYPE_UINT64"><code class="literal">G_VARIANT_TYPE_UINT64</code></a>; an unsigned 64 bit integer.</p></li> <li class="listitem"><p><code class="literal">h</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-HANDLE:CAPS" title="G_VARIANT_TYPE_HANDLE"><code class="literal">G_VARIANT_TYPE_HANDLE</code></a>; a signed 32 bit value that, by convention, is used as an index into an array of file descriptors that are sent alongside a D-Bus message.</p></li> <li class="listitem"><p><code class="literal">d</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DOUBLE:CAPS" title="G_VARIANT_TYPE_DOUBLE"><code class="literal">G_VARIANT_TYPE_DOUBLE</code></a>; a double precision floating point value.</p></li> <li class="listitem"><p><code class="literal">s</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-STRING:CAPS" title="G_VARIANT_TYPE_STRING"><code class="literal">G_VARIANT_TYPE_STRING</code></a>; a string.</p></li> <li class="listitem"><p><code class="literal">o</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-OBJECT-PATH:CAPS" title="G_VARIANT_TYPE_OBJECT_PATH"><code class="literal">G_VARIANT_TYPE_OBJECT_PATH</code></a>; a string in the form of a D-Bus object path.</p></li> <li class="listitem"><p><code class="literal">g</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-SIGNATURE:CAPS" title="G_VARIANT_TYPE_SIGNATURE"><code class="literal">G_VARIANT_TYPE_SIGNATURE</code></a>; a string in the form of a D-Bus type signature.</p></li> <li class="listitem"><p><code class="literal">?</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BASIC:CAPS" title="G_VARIANT_TYPE_BASIC"><code class="literal">G_VARIANT_TYPE_BASIC</code></a>; an indefinite type that is a supertype of any of the basic types.</p></li> <li class="listitem"><p><code class="literal">v</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-VARIANT:CAPS" title="G_VARIANT_TYPE_VARIANT"><code class="literal">G_VARIANT_TYPE_VARIANT</code></a>; a container type that contain any other type of value.</p></li> <li class="listitem"><p><code class="literal">a</code>: used as a prefix on another type string to mean an array of that type; the type string "ai", for example, is the type of an array of signed 32-bit integers.</p></li> <li class="listitem"><p><code class="literal">m</code>: used as a prefix on another type string to mean a "maybe", or "nullable", version of that type; the type string "ms", for example, is the type of a value that maybe contains a string, or maybe contains nothing.</p></li> <li class="listitem"><p><code class="literal">()</code>: used to enclose zero or more other concatenated type strings to create a tuple type; the type string "(is)", for example, is the type of a pair of an integer and a string.</p></li> <li class="listitem"><p><code class="literal">r</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE"><code class="literal">G_VARIANT_TYPE_TUPLE</code></a>; an indefinite type that is a supertype of any tuple type, regardless of the number of items.</p></li> <li class="listitem"> <p><code class="literal">{}</code>: used to enclose a basic type string concatenated with another type string to create a dictionary entry type, which usually appears inside of an array to form a dictionary; the type string "a{sd}", for example, is the type of a dictionary that maps strings to double precision floating point values.</p> <p>The first type (the basic type) is the key type and the second type is the value type. The reason that the first type is restricted to being a basic type is so that it can easily be hashed.</p> </li> <li class="listitem"><p><code class="literal">*</code>: the type string of <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ANY:CAPS" title="G_VARIANT_TYPE_ANY"><code class="literal">G_VARIANT_TYPE_ANY</code></a>; the indefinite type that is a supertype of all types. Note that, as with all type strings, this character represents exactly one type. It cannot be used inside of tuples to mean "any number of items".</p></li> </ul></div> <p>Any type string of a container that contains an indefinite type is, itself, an indefinite type. For example, the type string "a*" (corresponding to <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY"><code class="literal">G_VARIANT_TYPE_ARRAY</code></a>) is an indefinite type that is a supertype of every array type. "(*s)" is a supertype of all tuples that contain exactly two items where the second item is a string.</p> <p>"a{?*}" is an indefinite type that is a supertype of all arrays containing dictionary entries where the key is any basic type and the value is any type at all. This is, by definition, a dictionary, so this type string corresponds to <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DICTIONARY:CAPS" title="G_VARIANT_TYPE_DICTIONARY"><code class="literal">G_VARIANT_TYPE_DICTIONARY</code></a>. Note that, due to the restriction that the key of a dictionary entry must be a basic type, "{**}" is not a valid type string.</p> </div> </div> <div class="refsect1"> <a name="glib-GVariantType.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="G-VARIANT-TYPE:CAPS"></a><h3>G_VARIANT_TYPE()</h3> <pre class="programlisting"># define G_VARIANT_TYPE(type_string) (g_variant_type_checked_ ((type_string))) </pre> <p>Converts a string to a const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. Depending on the current debugging level, this function may perform a runtime check to ensure that <em class="parameter"><code>string</code></em> is a valid GVariant type string.</p> <p>It is always a programmer error to use this macro with an invalid type string. If in doubt, use <a class="link" href="glib-GVariantType.html#g-variant-type-string-is-valid" title="g_variant_type_string_is_valid ()"><code class="function">g_variant_type_string_is_valid()</code></a> to check if the string is valid.</p> <p>Since 2.24</p> <div class="refsect3"> <a name="G-VARIANT-TYPE.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type_string</p></td> <td class="parameter_description"><p>a well-formed <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> type string</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-free"></a><h3>g_variant_type_free ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_variant_type_free (<em class="parameter"><code><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Frees a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> that was allocated with <a class="link" href="glib-GVariantType.html#g-variant-type-copy" title="g_variant_type_copy ()"><code class="function">g_variant_type_copy()</code></a>, <a class="link" href="glib-GVariantType.html#g-variant-type-new" title="g_variant_type_new ()"><code class="function">g_variant_type_new()</code></a> or one of the container type constructor functions.</p> <p>In the case that <em class="parameter"><code>type</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, this function does nothing.</p> <p>Since 2.24</p> <div class="refsect3"> <a name="g-variant-type-free.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-copy"></a><h3>g_variant_type_copy ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_copy (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Makes a copy of a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value. <em class="parameter"><code>type</code></em> may not be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.</p> <div class="refsect3"> <a name="g-variant-type-copy.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-copy.returns"></a><h4>Returns</h4> <p>a new <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-new"></a><h3>g_variant_type_new ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_new (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *type_string</code></em>);</pre> <p>Creates a new <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> corresponding to the type string given by <em class="parameter"><code>type_string</code></em> . It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value.</p> <p>It is a programmer error to call this function with an invalid type string. Use <a class="link" href="glib-GVariantType.html#g-variant-type-string-is-valid" title="g_variant_type_string_is_valid ()"><code class="function">g_variant_type_string_is_valid()</code></a> if you are unsure.</p> <div class="refsect3"> <a name="g-variant-type-new.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type_string</p></td> <td class="parameter_description"><p>a valid GVariant type string</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-new.returns"></a><h4>Returns</h4> <p>a new <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> <p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p> </div> <hr> <div class="refsect2"> <a name="g-variant-type-string-is-valid"></a><h3>g_variant_type_string_is_valid ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_string_is_valid (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *type_string</code></em>);</pre> <p>Checks if <em class="parameter"><code>type_string</code></em> is a valid GVariant type string. This call is equivalent to calling <a class="link" href="glib-GVariantType.html#g-variant-type-string-scan" title="g_variant_type_string_scan ()"><code class="function">g_variant_type_string_scan()</code></a> and confirming that the following character is a nul terminator.</p> <div class="refsect3"> <a name="g-variant-type-string-is-valid.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type_string</p></td> <td class="parameter_description"><p>a pointer to any string</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-string-is-valid.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type_string</code></em> is exactly one valid type string</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-string-scan"></a><h3>g_variant_type_string_scan ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_string_scan (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>, <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *limit</code></em>, <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>);</pre> <p>Scan for a single complete and valid GVariant type string in <em class="parameter"><code>string</code></em> . The memory pointed to by <em class="parameter"><code>limit</code></em> (or bytes beyond it) is never accessed.</p> <p>If a valid type string is found, <em class="parameter"><code>endptr</code></em> is updated to point to the first character past the end of the string that was found and <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned.</p> <p>If there is no valid type string starting at <em class="parameter"><code>string</code></em> , or if the type string does not end before <em class="parameter"><code>limit</code></em> then <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <p>For the simple case of checking if a string is a valid type string, see <a class="link" href="glib-GVariantType.html#g-variant-type-string-is-valid" title="g_variant_type_string_is_valid ()"><code class="function">g_variant_type_string_is_valid()</code></a>.</p> <div class="refsect3"> <a name="g-variant-type-string-scan.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>string</p></td> <td class="parameter_description"><p>a pointer to any string</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>limit</p></td> <td class="parameter_description"><p>the end of <em class="parameter"><code>string</code></em> , or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr> <tr> <td class="parameter_name"><p>endptr</p></td> <td class="parameter_description"><p>location to store the end pointer, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-string-scan.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if a valid type string was found</p> </div> <p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p> </div> <hr> <div class="refsect2"> <a name="g-variant-type-get-string-length"></a><h3>g_variant_type_get_string_length ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_type_get_string_length (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Returns the length of the type string corresponding to the given <em class="parameter"><code>type</code></em> . This function must be used to determine the valid extent of the memory region returned by <a class="link" href="glib-GVariantType.html#g-variant-type-peek-string" title="g_variant_type_peek_string ()"><code class="function">g_variant_type_peek_string()</code></a>.</p> <div class="refsect3"> <a name="g-variant-type-get-string-length.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-get-string-length.returns"></a><h4>Returns</h4> <p> the length of the corresponding type string</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-peek-string"></a><h3>g_variant_type_peek_string ()</h3> <pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_type_peek_string (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Returns the type string corresponding to the given <em class="parameter"><code>type</code></em> . The result is not nul-terminated; in order to determine its length you must call <a class="link" href="glib-GVariantType.html#g-variant-type-get-string-length" title="g_variant_type_get_string_length ()"><code class="function">g_variant_type_get_string_length()</code></a>.</p> <p>To get a nul-terminated string, see <a class="link" href="glib-GVariantType.html#g-variant-type-dup-string" title="g_variant_type_dup_string ()"><code class="function">g_variant_type_dup_string()</code></a>.</p> <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p> <div class="refsect3"> <a name="g-variant-type-peek-string.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-peek-string.returns"></a><h4>Returns</h4> <p> the corresponding type string (not nul-terminated)</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-dup-string"></a><h3>g_variant_type_dup_string ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_type_dup_string (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Returns a newly-allocated copy of the type string corresponding to <em class="parameter"><code>type</code></em> . The returned string is nul-terminated. It is appropriate to call <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a> on the return value.</p> <div class="refsect3"> <a name="g-variant-type-dup-string.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-dup-string.returns"></a><h4>Returns</h4> <p>the corresponding type string</p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-definite"></a><h3>g_variant_type_is_definite ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_definite (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is definite (ie: not indefinite).</p> <p>A type is definite if its type string does not contain any indefinite type characters ('*', '?', or 'r').</p> <p>A <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance may not have an indefinite type, so calling this function on the result of <a class="link" href="glib-GVariant.html#g-variant-get-type" title="g_variant_get_type ()"><code class="function">g_variant_get_type()</code></a> will always result in <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> being returned. Calling this function on an indefinite type like <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY"><code class="literal">G_VARIANT_TYPE_ARRAY</code></a>, however, will result in <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> being returned.</p> <div class="refsect3"> <a name="g-variant-type-is-definite.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-definite.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is definite</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-container"></a><h3>g_variant_type_is_container ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_container (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is a container type.</p> <p>Container types are any array, maybe, tuple, or dictionary entry types plus the variant type.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> for any indefinite type for which every definite subtype is a container -- <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY"><code class="literal">G_VARIANT_TYPE_ARRAY</code></a>, for example.</p> <div class="refsect3"> <a name="g-variant-type-is-container.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-container.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a container type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-basic"></a><h3>g_variant_type_is_basic ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_basic (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is a basic type.</p> <p>Basic types are booleans, bytes, integers, doubles, strings, object paths and signatures.</p> <p>Only a basic type may be used as the key of a dictionary entry.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> for all indefinite types except <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BASIC:CAPS" title="G_VARIANT_TYPE_BASIC"><code class="literal">G_VARIANT_TYPE_BASIC</code></a>.</p> <div class="refsect3"> <a name="g-variant-type-is-basic.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-basic.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a basic type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-maybe"></a><h3>g_variant_type_is_maybe ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_maybe (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is a maybe type. This is true if the type string for <em class="parameter"><code>type</code></em> starts with an 'm'.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> for any indefinite type for which every definite subtype is a maybe type -- <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-MAYBE:CAPS" title="G_VARIANT_TYPE_MAYBE"><code class="literal">G_VARIANT_TYPE_MAYBE</code></a>, for example.</p> <div class="refsect3"> <a name="g-variant-type-is-maybe.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-maybe.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a maybe type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-array"></a><h3>g_variant_type_is_array ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_array (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is an array type. This is true if the type string for <em class="parameter"><code>type</code></em> starts with an 'a'.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> for any indefinite type for which every definite subtype is an array type -- <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY"><code class="literal">G_VARIANT_TYPE_ARRAY</code></a>, for example.</p> <div class="refsect3"> <a name="g-variant-type-is-array.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-array.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is an array type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-tuple"></a><h3>g_variant_type_is_tuple ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_tuple (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is a tuple type. This is true if the type string for <em class="parameter"><code>type</code></em> starts with a '(' or if <em class="parameter"><code>type</code></em> is <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE"><code class="literal">G_VARIANT_TYPE_TUPLE</code></a>.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> for any indefinite type for which every definite subtype is a tuple type -- <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE"><code class="literal">G_VARIANT_TYPE_TUPLE</code></a>, for example.</p> <div class="refsect3"> <a name="g-variant-type-is-tuple.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-tuple.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a tuple type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-dict-entry"></a><h3>g_variant_type_is_dict_entry ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_dict_entry (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is a dictionary entry type. This is true if the type string for <em class="parameter"><code>type</code></em> starts with a '{'.</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> for any indefinite type for which every definite subtype is a dictionary entry type -- <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DICT-ENTRY:CAPS" title="G_VARIANT_TYPE_DICT_ENTRY"><code class="literal">G_VARIANT_TYPE_DICT_ENTRY</code></a>, for example.</p> <div class="refsect3"> <a name="g-variant-type-is-dict-entry.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-dict-entry.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a dictionary entry type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-variant"></a><h3>g_variant_type_is_variant ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_variant (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines if the given <em class="parameter"><code>type</code></em> is the variant type.</p> <div class="refsect3"> <a name="g-variant-type-is-variant.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-variant.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is the variant type</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-hash"></a><h3>g_variant_type_hash ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="returnvalue">guint</span></a> g_variant_type_hash (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> type</code></em>);</pre> <p>Hashes <em class="parameter"><code>type</code></em> .</p> <p>The argument type of <em class="parameter"><code>type</code></em> is only <a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> to allow use with <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a> without function pointer casting. A valid <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> must be provided.</p> <div class="refsect3"> <a name="g-variant-type-hash.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GVariantType]</span></td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-hash.returns"></a><h4>Returns</h4> <p> the hash value</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-equal"></a><h3>g_variant_type_equal ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_equal (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> type1</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> type2</code></em>);</pre> <p>Compares <em class="parameter"><code>type1</code></em> and <em class="parameter"><code>type2</code></em> for equality.</p> <p>Only returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the types are exactly equal. Even if one type is an indefinite type and the other is a subtype of it, <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> will be returned if they are not exactly equal. If you want to check for subtypes, use <a class="link" href="glib-GVariantType.html#g-variant-type-is-subtype-of" title="g_variant_type_is_subtype_of ()"><code class="function">g_variant_type_is_subtype_of()</code></a>.</p> <p>The argument types of <em class="parameter"><code>type1</code></em> and <em class="parameter"><code>type2</code></em> are only <a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> to allow use with <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a> without function pointer casting. For both arguments, a valid <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> must be provided.</p> <div class="refsect3"> <a name="g-variant-type-equal.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>type1</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GVariantType]</span></td> </tr> <tr> <td class="parameter_name"><p>type2</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GVariantType]</span></td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-equal.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type1</code></em> and <em class="parameter"><code>type2</code></em> are exactly equal</p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-is-subtype-of"></a><h3>g_variant_type_is_subtype_of ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_type_is_subtype_of (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>, <em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *supertype</code></em>);</pre> <p>Checks if <em class="parameter"><code>type</code></em> is a subtype of <em class="parameter"><code>supertype</code></em> .</p> <p>This function returns <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a subtype of <em class="parameter"><code>supertype</code></em> . All types are considered to be subtypes of themselves. Aside from that, only indefinite types can have subtypes.</p> <div class="refsect3"> <a name="g-variant-type-is-subtype-of.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>supertype</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-is-subtype-of.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>type</code></em> is a subtype of <em class="parameter"><code>supertype</code></em> </p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-new-maybe"></a><h3>g_variant_type_new_maybe ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_new_maybe (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *element</code></em>);</pre> <p>Constructs the type corresponding to a maybe instance containing type <em class="parameter"><code>type</code></em> or Nothing.</p> <p>It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value.</p> <p><span class="annotation">[<acronym title="This symbol is a constructor, not a static method."><span class="acronym">constructor</span></acronym>]</span></p> <div class="refsect3"> <a name="g-variant-type-new-maybe.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>element</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-new-maybe.returns"></a><h4>Returns</h4> <p>a new maybe <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-new-array"></a><h3>g_variant_type_new_array ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_new_array (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *element</code></em>);</pre> <p>Constructs the type corresponding to an array of elements of the type <em class="parameter"><code>type</code></em> .</p> <p>It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value.</p> <p><span class="annotation">[<acronym title="This symbol is a constructor, not a static method."><span class="acronym">constructor</span></acronym>]</span></p> <div class="refsect3"> <a name="g-variant-type-new-array.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>element</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-new-array.returns"></a><h4>Returns</h4> <p>a new array <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-new-tuple"></a><h3>g_variant_type_new_tuple ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_new_tuple (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> * const *items</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="type">gint</span></a> length</code></em>);</pre> <p>Constructs a new tuple type, from <em class="parameter"><code>items</code></em> .</p> <p><em class="parameter"><code>length</code></em> is the number of items in <em class="parameter"><code>items</code></em> , or -1 to indicate that <em class="parameter"><code>items</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>-terminated.</p> <p>It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value.</p> <div class="refsect3"> <a name="g-variant-type-new-tuple.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>items</p></td> <td class="parameter_description"><p>an array of <span class="type">GVariantTypes</span>, one for each item. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=length]</span></td> </tr> <tr> <td class="parameter_name"><p>length</p></td> <td class="parameter_description"><p>the length of <em class="parameter"><code>items</code></em> , or -1</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-new-tuple.returns"></a><h4>Returns</h4> <p>a new tuple <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-new-dict-entry"></a><h3>g_variant_type_new_dict_entry ()</h3> <pre class="programlisting"><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_new_dict_entry (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *key</code></em>, <em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *value</code></em>);</pre> <p>Constructs the type corresponding to a dictionary entry with a key of type <em class="parameter"><code>key</code></em> and a value of type <em class="parameter"><code>value</code></em> .</p> <p>It is appropriate to call <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a> on the return value.</p> <p><span class="annotation">[<acronym title="This symbol is a constructor, not a static method."><span class="acronym">constructor</span></acronym>]</span></p> <div class="refsect3"> <a name="g-variant-type-new-dict-entry.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>key</p></td> <td class="parameter_description"><p>a basic <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>value</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-new-dict-entry.returns"></a><h4>Returns</h4> <p>a new dictionary entry <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-element"></a><h3>g_variant_type_element ()</h3> <pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_element (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the element type of an array or maybe type.</p> <p>This function may only be used with array or maybe types.</p> <div class="refsect3"> <a name="g-variant-type-element.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>an array or maybe <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-element.returns"></a><h4>Returns</h4> <p>the element type of <em class="parameter"><code>type</code></em> </p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-n-items"></a><h3>g_variant_type_n_items ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_type_n_items (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the number of items contained in a tuple or dictionary entry type.</p> <p>This function may only be used with tuple or dictionary entry types, but must not be used with the generic tuple type <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE"><code class="literal">G_VARIANT_TYPE_TUPLE</code></a>.</p> <p>In the case of a dictionary entry type, this function will always return 2.</p> <div class="refsect3"> <a name="g-variant-type-n-items.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a tuple or dictionary entry <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-n-items.returns"></a><h4>Returns</h4> <p> the number of items in <em class="parameter"><code>type</code></em> </p> <p>Since 2.24</p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-first"></a><h3>g_variant_type_first ()</h3> <pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_first (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the first item type of a tuple or dictionary entry type.</p> <p>This function may only be used with tuple or dictionary entry types, but must not be used with the generic tuple type <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-TUPLE:CAPS" title="G_VARIANT_TYPE_TUPLE"><code class="literal">G_VARIANT_TYPE_TUPLE</code></a>.</p> <p>In the case of a dictionary entry type, this returns the type of the key.</p> <p><a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is returned in case of <em class="parameter"><code>type</code></em> being <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UNIT:CAPS" title="G_VARIANT_TYPE_UNIT"><code class="literal">G_VARIANT_TYPE_UNIT</code></a>.</p> <p>This call, together with <a class="link" href="glib-GVariantType.html#g-variant-type-next" title="g_variant_type_next ()"><code class="function">g_variant_type_next()</code></a> provides an iterator interface over tuple and dictionary entry types.</p> <div class="refsect3"> <a name="g-variant-type-first.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a tuple or dictionary entry <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-first.returns"></a><h4>Returns</h4> <p>the first item type of <em class="parameter"><code>type</code></em> , or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-next"></a><h3>g_variant_type_next ()</h3> <pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_next (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the next item type of a tuple or dictionary entry type.</p> <p><em class="parameter"><code>type</code></em> must be the result of a previous call to <a class="link" href="glib-GVariantType.html#g-variant-type-first" title="g_variant_type_first ()"><code class="function">g_variant_type_first()</code></a> or <a class="link" href="glib-GVariantType.html#g-variant-type-next" title="g_variant_type_next ()"><code class="function">g_variant_type_next()</code></a>.</p> <p>If called on the key type of a dictionary entry then this call returns the value type. If called on the value type of a dictionary entry then this call returns <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.</p> <p>For tuples, <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is returned when <em class="parameter"><code>type</code></em> is the last item in a tuple.</p> <div class="refsect3"> <a name="g-variant-type-next.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> from a previous call</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-next.returns"></a><h4>Returns</h4> <p>the next <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> after <em class="parameter"><code>type</code></em> , or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-key"></a><h3>g_variant_type_key ()</h3> <pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_key (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the key type of a dictionary entry type.</p> <p>This function may only be used with a dictionary entry type. Other than the additional restriction, this call is equivalent to <a class="link" href="glib-GVariantType.html#g-variant-type-first" title="g_variant_type_first ()"><code class="function">g_variant_type_first()</code></a>.</p> <div class="refsect3"> <a name="g-variant-type-key.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a dictionary entry <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-key.returns"></a><h4>Returns</h4> <p>the key type of the dictionary entry</p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="g-variant-type-value"></a><h3>g_variant_type_value ()</h3> <pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_type_value (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre> <p>Determines the value type of a dictionary entry type.</p> <p>This function may only be used with a dictionary entry type.</p> <div class="refsect3"> <a name="g-variant-type-value.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>a dictionary entry <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-variant-type-value.returns"></a><h4>Returns</h4> <p>the value type of the dictionary entry</p> <p>Since 2.24. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> </div> </div> <div class="refsect1"> <a name="glib-GVariantType.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GVariantType"></a><h3>GVariantType</h3> <pre class="programlisting">typedef struct _GVariantType GVariantType;</pre> <p>A type in the GVariant type system.</p> <p>Two types may not be compared by value; use <a class="link" href="glib-GVariantType.html#g-variant-type-equal" title="g_variant_type_equal ()"><code class="function">g_variant_type_equal()</code></a> or <a class="link" href="glib-GVariantType.html#g-variant-type-is-subtype-of" title="g_variant_type_is_subtype_of ()"><code class="function">g_variant_type_is_subtype_of()</code></a>. May be copied using <a class="link" href="glib-GVariantType.html#g-variant-type-copy" title="g_variant_type_copy ()"><code class="function">g_variant_type_copy()</code></a> and freed using <a class="link" href="glib-GVariantType.html#g-variant-type-free" title="g_variant_type_free ()"><code class="function">g_variant_type_free()</code></a>.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-BOOLEAN:CAPS"></a><h3>G_VARIANT_TYPE_BOOLEAN</h3> <pre class="programlisting">#define G_VARIANT_TYPE_BOOLEAN ((const GVariantType *) "b") </pre> <p>The type of a value that can be either <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> or <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-BYTE:CAPS"></a><h3>G_VARIANT_TYPE_BYTE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_BYTE ((const GVariantType *) "y") </pre> <p>The type of an integer value that can range from 0 to 255.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-INT16:CAPS"></a><h3>G_VARIANT_TYPE_INT16</h3> <pre class="programlisting">#define G_VARIANT_TYPE_INT16 ((const GVariantType *) "n") </pre> <p>The type of an integer value that can range from -32768 to 32767.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-UINT16:CAPS"></a><h3>G_VARIANT_TYPE_UINT16</h3> <pre class="programlisting">#define G_VARIANT_TYPE_UINT16 ((const GVariantType *) "q") </pre> <p>The type of an integer value that can range from 0 to 65535. There were about this many people living in Toronto in the 1870s.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-INT32:CAPS"></a><h3>G_VARIANT_TYPE_INT32</h3> <pre class="programlisting">#define G_VARIANT_TYPE_INT32 ((const GVariantType *) "i") </pre> <p>The type of an integer value that can range from -2147483648 to 2147483647.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-UINT32:CAPS"></a><h3>G_VARIANT_TYPE_UINT32</h3> <pre class="programlisting">#define G_VARIANT_TYPE_UINT32 ((const GVariantType *) "u") </pre> <p>The type of an integer value that can range from 0 to 4294967295. That's one number for everyone who was around in the late 1970s.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-INT64:CAPS"></a><h3>G_VARIANT_TYPE_INT64</h3> <pre class="programlisting">#define G_VARIANT_TYPE_INT64 ((const GVariantType *) "x") </pre> <p>The type of an integer value that can range from -9223372036854775808 to 9223372036854775807.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-UINT64:CAPS"></a><h3>G_VARIANT_TYPE_UINT64</h3> <pre class="programlisting">#define G_VARIANT_TYPE_UINT64 ((const GVariantType *) "t") </pre> <p>The type of an integer value that can range from 0 to 18446744073709551615 (inclusive). That's a really big number, but a Rubik's cube can have a bit more than twice as many possible positions.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-HANDLE:CAPS"></a><h3>G_VARIANT_TYPE_HANDLE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_HANDLE ((const GVariantType *) "h") </pre> <p>The type of a 32bit signed integer value, that by convention, is used as an index into an array of file descriptors that are sent alongside a D-Bus message.</p> <p>If you are not interacting with D-Bus, then there is no reason to make use of this type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-DOUBLE:CAPS"></a><h3>G_VARIANT_TYPE_DOUBLE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_DOUBLE ((const GVariantType *) "d") </pre> <p>The type of a double precision IEEE754 floating point number. These guys go up to about 1.80e308 (plus and minus) but miss out on some numbers in between. In any case, that's far greater than the estimated number of fundamental particles in the observable universe.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-STRING:CAPS"></a><h3>G_VARIANT_TYPE_STRING</h3> <pre class="programlisting">#define G_VARIANT_TYPE_STRING ((const GVariantType *) "s") </pre> <p>The type of a string. "" is a string. <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is not a string.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-OBJECT-PATH:CAPS"></a><h3>G_VARIANT_TYPE_OBJECT_PATH</h3> <pre class="programlisting">#define G_VARIANT_TYPE_OBJECT_PATH ((const GVariantType *) "o") </pre> <p>The type of a D-Bus object reference. These are strings of a specific format used to identify objects at a given destination on the bus.</p> <p>If you are not interacting with D-Bus, then there is no reason to make use of this type. If you are, then the D-Bus specification contains a precise description of valid object paths.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-SIGNATURE:CAPS"></a><h3>G_VARIANT_TYPE_SIGNATURE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_SIGNATURE ((const GVariantType *) "g") </pre> <p>The type of a D-Bus type signature. These are strings of a specific format used as type signatures for D-Bus methods and messages.</p> <p>If you are not interacting with D-Bus, then there is no reason to make use of this type. If you are, then the D-Bus specification contains a precise description of valid signature strings.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-VARIANT:CAPS"></a><h3>G_VARIANT_TYPE_VARIANT</h3> <pre class="programlisting">#define G_VARIANT_TYPE_VARIANT ((const GVariantType *) "v") </pre> <p>The type of a box that contains any other value (including another variant).</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-ANY:CAPS"></a><h3>G_VARIANT_TYPE_ANY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_ANY ((const GVariantType *) "*") </pre> <p>An indefinite type that is a supertype of every type (including itself).</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-BASIC:CAPS"></a><h3>G_VARIANT_TYPE_BASIC</h3> <pre class="programlisting">#define G_VARIANT_TYPE_BASIC ((const GVariantType *) "?") </pre> <p>An indefinite type that is a supertype of every basic (ie: non-container) type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-MAYBE:CAPS"></a><h3>G_VARIANT_TYPE_MAYBE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_MAYBE ((const GVariantType *) "m*") </pre> <p>An indefinite type that is a supertype of every maybe type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-ARRAY:CAPS"></a><h3>G_VARIANT_TYPE_ARRAY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_ARRAY ((const GVariantType *) "a*") </pre> <p>An indefinite type that is a supertype of every array type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-TUPLE:CAPS"></a><h3>G_VARIANT_TYPE_TUPLE</h3> <pre class="programlisting">#define G_VARIANT_TYPE_TUPLE ((const GVariantType *) "r") </pre> <p>An indefinite type that is a supertype of every tuple type, regardless of the number of items in the tuple.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-UNIT:CAPS"></a><h3>G_VARIANT_TYPE_UNIT</h3> <pre class="programlisting">#define G_VARIANT_TYPE_UNIT ((const GVariantType *) "()") </pre> <p>The empty tuple type. Has only one instance. Known also as "triv" or "void".</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-DICT-ENTRY:CAPS"></a><h3>G_VARIANT_TYPE_DICT_ENTRY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_DICT_ENTRY ((const GVariantType *) "{?*}") </pre> <p>An indefinite type that is a supertype of every dictionary entry type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-DICTIONARY:CAPS"></a><h3>G_VARIANT_TYPE_DICTIONARY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_DICTIONARY ((const GVariantType *) "a{?*}") </pre> <p>An indefinite type that is a supertype of every dictionary type -- that is, any array type that has an element type equal to any dictionary entry type.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-STRING-ARRAY:CAPS"></a><h3>G_VARIANT_TYPE_STRING_ARRAY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_STRING_ARRAY ((const GVariantType *) "as") </pre> <p>The type of an array of strings.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-OBJECT-PATH-ARRAY:CAPS"></a><h3>G_VARIANT_TYPE_OBJECT_PATH_ARRAY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_OBJECT_PATH_ARRAY ((const GVariantType *) "ao") </pre> <p>The type of an array of object paths.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-BYTESTRING:CAPS"></a><h3>G_VARIANT_TYPE_BYTESTRING</h3> <pre class="programlisting">#define G_VARIANT_TYPE_BYTESTRING ((const GVariantType *) "ay") </pre> <p>The type of an array of bytes. This type is commonly used to pass around strings that may not be valid utf8. In that case, the convention is that the nul terminator character should be included as the last character in the array.</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-BYTESTRING-ARRAY:CAPS"></a><h3>G_VARIANT_TYPE_BYTESTRING_ARRAY</h3> <pre class="programlisting">#define G_VARIANT_TYPE_BYTESTRING_ARRAY ((const GVariantType *) "aay") </pre> <p>The type of an array of byte strings (an array of arrays of bytes).</p> </div> <hr> <div class="refsect2"> <a name="G-VARIANT-TYPE-VARDICT:CAPS"></a><h3>G_VARIANT_TYPE_VARDICT</h3> <pre class="programlisting">#define G_VARIANT_TYPE_VARDICT ((const GVariantType *) "a{sv}") </pre> <p>The type of a dictionary mapping strings to variants (the ubiquitous "a{sv}" type).</p> <p class="since">Since: <a class="link" href="api-index-2-30.html#api-index-2.30">2.30</a></p> </div> </div> <div class="refsect1"> <a name="glib-GVariantType.see-also"></a><h2>See Also</h2> <p><a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>